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I've always assumed cash-only businesses are up to something mildly shady, like tax evasion (local example, Paseo).

Also, I've encountered a couple card-only businesses lately (local example, Optimism Brewing).

Paseo is an immigrant restaurant in a very expensive neighborhood.

I'm not sure they would be able to stay open if 2-5% was cut off their revenue. It's just money; not a conspiracy.